Malicious PDF — malware analysis report

Static analysis result for SHA-256 d323fbffda8fb4e1…

MALICIOUS

PDF

95.3 KB Created: 2021-09-01 02:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e66257af84e4bda11561563cd9da0f22 SHA-1: b82ace6f9416b3b8bff496fb6bfddeb3b14bb1e9 SHA-256: d323fbffda8fb4e1ef8160f4bdfdf2f2d44c6c19b9280b7e1ae167beb9c5a636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links are likely intended to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0c842354---kelevabefisiwufurejelafum.pdf In PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/5405155122.pdfIn PDF document text
    • https://banghenails.com/upload/file/16778761104.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa15a079e---80279330119.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e200b5c249---wadejelulufujewexuku.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/37758618497.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/gakovanuwufaloti.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9814a35d---puritifabutixap.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b57a43824495814f5bc0d12074301bb3/pinafufemafaveduk.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/67953905006.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/66b0f3df2b00e02dacb4060a87c92890/tekumajeguwekoxozuxa.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/54140457359.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f0e09db5---vovuvezun.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/59d56c493730e26d5d7ad13ba68bc93d/gapukonojiz.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/230537142834.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/rutaloj.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j2iig6kcvlv5kjdkqkdirgshf2/49693343271.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0a34102b---90863161363.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161074e7ba6808---76754259510.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f2deabf3733c72f1d191ba98e63cd763/22274468073.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bbcd6ba0---bibabogawotajizujezib.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/vekimipotuxed.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/12808607490.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082387adf801---13601239552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=taciturnity+definition+and+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 19092 bytes
SHA-256: 83c37bcad48a91b2959ba688940b849c7d0a5843f486dff14aaa994e941db906
font_01_sfnt_off00013e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001562e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562E 10780 bytes
SHA-256: 2ddb23cd95dad5d74d9e0a0cd25adf7841869cd72a34fa72486a61b0942ec5f0

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